Trift-Formation
Back to Aar massifRepresentation and status
- Index
- hTr
- Color CMYK
- 40 / 20 / 40 / 0
- Color RGB
- R: 160 G: 180 B: 160
- Rank
- lithostratigraphic Formation
- Validity
- Unit is in Use
- Status
- informal term
Nomenclature
- Deutsch
- Trift-Formation
- Français
- Formation du Trift
- Italiano
- Formazione del Trift
- English
- Trift Formation
- Origin of the Name
-
Triftgletscher (BE), Innertkirchen (Das Typusprofil liegt unterhalb der Triffthütte SAC)
- Historical Variants
-
Trift-Formation (Schenker 1986, Schenker & Abrecht 1987), Trift Formation (Berger et al. 2017)
- Nomenclatorial Remarks
-
Glacier du Trift, pont suspendu du Trift
Description
- Description
-
Tonschiefer, Konglomerate und vulkanogene Abfolgen (Pyroklastite und Rhyolithe)
- Thickness
- Max. 140 m am Chilchlistock, ca. 100 m an der Trifthütte.
Age
- Age at top
-
- Late Pennsylvanian
- Age at base
-
- Late Pennsylvanian
Palaenography and tectonic
- Paleogeography
- European Continent
- Tectonic unit (resp. main category)
References
- Definition
-
(2017) :
Geological Map of the Aar Massif, Tavetsch and Gotthard Nappes. Geological Special Map 1:100'000, Explanatory Notes 129
p.46: The Trift Formation, outcropping in the Trift area, contains a fine- to coarse-grained clastic metasedimentary rocks (metaconglomerates) with volcanic and volcaniclastic intercalations (Fig.6, see also detailed lithostratigraphic descriptions given by SCHENKER & ABRECHT 1987 and OBERHÄNSLI et al.1988). SCHENKER & ABRECHT (1987) reported a metamorphic garnet-biotite parageneses in the more sandy parts of the formation. This indicates the influence of the thermal aureole of the intruding Variscan plutonic rocks since the much younger regional Alpine metamorphism did not reach temperatures high enough to form this parageneses. Despite the lack of outcropping intrusive contacts, it was assumed that also this formation has been buried at depths, which would be consistent with the intrusion depth estimated for plutonic rocks of the Haslital Group (p. 51 f.). The Trift Formation generally marks the southeastern border of the Ferden-Guttannen Zone (Guttannen Gneiss Complex, SCHENKER & ABRECHT 1987). Further to the southwest, two small and isolated occurrences of Late Carboniferous rocks north of the Hienderstock and south of the Agassizhorn are assigned to the Trift Formation due to their similar tectonic position at the southeastern border of the Guttannen Gneiss Complex.